#21 United States of America - Literally anyone

This had to come sometime, so here it is. WWE has about 50+ superstars on their roster who are American. That is excluding all the Americans who are made to portray foreign figures. A choice among them will be really hard. But we can be assured someone good will be participating.
As to who it should be, it can be anyone really. Any American wrestler who isn't booked on the show can take part. My choice however, is Daniel Bryan. WWE used the tag line, "..to determine the Best in the World." Daniel Bryan has gone on record several times to claim he is the Best Wrestler in the World. So a good story line is inevitable if Bryan competes.
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Whoever competes on behalf of USA will be favorites to win the entire thing naturally. If Daniel Bryan does compete, he might just win it all considering he has suffered quite a few defeats at the hands of The Miz.